socket_serial.c

Go to the documentation of this file.

// SPDX-FileCopyrightText: 2017 pancake <pancake@nopcode.org>
// SPDX-License-Identifier: LGPL-3.0-only
 
#include <rz_socket.h>
#if __UNIX__
 
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <termios.h>
 
static int set_interface_attribs(int fd, int speed, int parity) {
    struct termios tty;
    memset(&tty, 0, sizeof tty);
    if (tcgetattr(fd, &tty) != 0) {
        return -1;
    }
    cfsetospeed(&tty, speed);
    cfsetispeed(&tty, speed);
 
    tty.c_cflag = (tty.c_cflag & ~CSIZE) | CS8; // 8-bit chars
    // disable IGNBRK for mismatched speed tests; otherwise receive break
    // as \000 chars
    tty.c_iflag &= ~IGNBRK; // disable break processing
    tty.c_lflag = 0; // no signaling chars, no echo,
    // no canonical processing
    tty.c_oflag = 0; // no remapping, no delays
    tty.c_cc[VMIN] = 0; // read doesn't block
    tty.c_cc[VTIME] = 5; // 0.5 seconds read timeout
 
    tty.c_iflag &= ~(IXON | IXOFF | IXANY); // shut off xon/xoff ctrl
 
    tty.c_cflag |= (CLOCAL | CREAD); // ignore modem controls,
    // enable reading
    tty.c_cflag &= ~(PARENB | PARODD); // shut off parity
    tty.c_cflag |= parity;
    tty.c_cflag &= ~CSTOPB;
#ifdef CRTSCTS
    tty.c_cflag &= ~CRTSCTS;
#endif
 
    if (tcsetattr(fd, TCSANOW, &tty) != 0) {
        return -1;
    }
    return 0;
}
 
RZ_API int rz_socket_connect_serial(RzSocket *sock, const char *path, int speed, int parity) {
    int fd = open(path, O_RDWR | O_SYNC | O_BINARY, 0); // O_NOCTY
    if (fd == -1) {
        return -1;
    }
    if (speed < 1) {
        speed = 9600; // 19200
    }
    (void)set_interface_attribs(fd, speed, parity);
    sock->fd = fd;
    return fd;
}
 
#else // __UNIX__
 
RZ_API int rz_socket_connect_serial(RzSocket *sock, const char *path, int speed, int parity) {
    return -1;
}
#endif